Endocrinology is the study of how our bodies work with hormones. Hormones are like chemical messengers in our bodies. They travel through our blood and tell our cells to do important things. Endocrinologists use hormones to help our bodies stay healthy. For example, when someone has diabetes, their body might need extra hormone levels in their blood to help them stay healthy. Endocrinologists help them by giving them the right medications or treatments. Endocrinologists also look for any signs of hormone problems, which can be signs of health problems.